Strap for Avigation

The lug width of the Longines Heritage L2.831.4.53.2 is 25mm. This measurement refers to the internal distance between the two spring bar pins that protrude from the case, where the strap is attached. You can verify this by measuring directly with a ruler or digital calliper between the two pins, ensuring that any purchased strap is compatible with this specific dimension.

For the Longines Heritage L2.831.4.53.2, we recommend straps in alligator or vegetable-tanned calf leather for an elegant approach, or heavy-duty canvas NATO straps to emphasise the model's military heritage. Your choice depends on usage: if primarily formal wear, select premium leather; if versatile or sporty, choose NATO or rubber. Milano Straps offers a curated selection of 25mm straps customisable in colour, thickness and stitching thread.

To change the strap, obtain a spring bar removal tool or consult an expert. Position the watch securely, locate the two pins supporting the strap, gently push towards the case centre to disengage them one at a time, and remove the old strap. Insert the pins into the new strap, ensuring they are perfectly aligned, and press until you hear or feel a click. If you are inexperienced, the Casati Milano atelier provides this service by appointment.

Yes, a quality aftermarket strap manufactured for the 25mm lug width is fully compatible and reliable. Milano Straps produces artisanal straps using certified leather and reinforced stitching, equivalent to or superior to original straps. The key is to select an experienced craftsperson familiar with your watch's technical specifications and who uses sustainable materials. Custom straps from Casati Milano, for example, include an 18-month warranty.

A quality artisanal leather strap, worn regularly (3–5 days per week), has an average lifespan of 3–5 years before showing significant wear such as cracks or tears. Longevity depends on factors including the tanning method employed (vegetable tanning resists degradation longer), frequency of exposure to moisture and sunlight, and periodic care. A shell cordovan or alligator strap lasts considerably longer than ordinary calf. Milano Straps recommends rotating between multiple straps periodically and applying specialist conditioners to extend usable life.